These results were from Reg's c_poise program. The band is 75 meters and the
coils were about 70 uH. The coils were a relatively large diameter, on the order
of a meter. The wire lengths were about 20 meters. By varying the length the
coil, the coil wire may be varies from 1mm to 12mm.

Richard Clark wrote:
On Sat, 18 Feb 2006 08:20:38 -0800, dansawyeror
wrote:


The devil is in the details. Modeling shows large coils with 1 mm wire have a Q
in the range of a few hundred. On the other hand a coil with 12 mm tubing has a
Q of about 2000. The R of the 1 mm coil is about 6 Ohms while the 12 mm coil is
on the order of 1 Ohm.

Given these model results it says there is a significant difference between 1 mm
and 12 mm coils.


Hi Dan,

In the details, indeed.

What is the LENGTH of wire in this 6 Ohm resistor? What is the LENGTH
of wire in this 1 Ohm resistor? How many turns are in these "large
coils?" What is their diameter? What is their solenoid length?

Without these details, there is nothing said that is significant.

73's
Richard Clark, KB7QHC